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Add methods for sell/buy via given path for Uniswap v2

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This commit is contained in:
Mubaris NK 2020-10-09 12:10:30 +05:30
parent 08dc6f00d0
commit 2b4f09586a
1 changed files with 152 additions and 1 deletions
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153
contracts/connectors/uniswap.sol
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@ -113,7 +113,7 @@ contract UniswapHelpers is Stores, DSMath {
sellAmt,
paths
);
buyAmt = amts[1];
buyAmt = amts[amts.length - 1];
}
function getExpectedSellAmt(
@ -136,6 +136,17 @@ contract UniswapHelpers is Stores, DSMath {
require(pair != address(0), "No-exchange-address");
}
function checkPaths(
IUniswapV2Router02 router,
address[] memory paths
) internal view {
for (uint i; i < paths.length - 1; i++) {
require(paths[i] != paths[i + 1], "Wrong-path");
address pair = IUniswapV2Factory(router.factory()).getPair(paths[i], paths[i + 1]);
require(pair != address(0), "No-exchange-address");
}
}
function getPaths(
address buyAddr,
address sellAddr
@ -416,6 +427,58 @@ contract UniswapResolver is UniswapLiquidity {
uint256 setId
);
event LogBuyPath(
address indexed buyToken,
address indexed sellToken,
uint256 buyAmt,
uint256 sellAmt,
address[] path,
uint256 getId,
uint256 setId
);
event LogSellPath(
address indexed buyToken,
address indexed sellToken,
uint256 buyAmt,
uint256 sellAmt,
address[] path,
uint256 getId,
uint256 setId
);
function emitLogBuyPath(
address buyToken,
address sellToken,
uint256 buyAmt,
uint256 sellAmt,
address[] memory path,
uint256 getId,
uint256 setId
) internal {
emit LogBuyPath(buyToken, sellToken, buyAmt, sellAmt, path, getId, setId);
bytes32 _eventCode = keccak256("LogBuyPath(address,address,uint256,uint256,address[],uint256,uint256)");
bytes memory _eventParam = abi.encode(buyToken, sellToken, buyAmt, sellAmt, path, getId, setId);
(uint _type, uint _id) = connectorID();
EventInterface(getEventAddr()).emitEvent(_type, _id, _eventCode, _eventParam);
}
function emitLogSellPath(
address buyToken,
address sellToken,
uint256 buyAmt,
uint256 sellAmt,
address[] memory path,
uint256 getId,
uint256 setId
) internal {
emit LogSellPath(buyToken, sellToken, buyAmt, sellAmt, path, getId, setId);
bytes32 _eventCode = keccak256("LogSellPath(address,address,uint256,uint256,address[],uint256,uint256)");
bytes memory _eventParam = abi.encode(buyToken, sellToken, buyAmt, sellAmt, path, getId, setId);
(uint _type, uint _id) = connectorID();
EventInterface(getEventAddr()).emitEvent(_type, _id, _eventCode, _eventParam);
}
/**
* @dev Buy ETH/ERC20_Token.
* @param buyAddr buying token address.(For ETH: 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE)
@ -523,6 +586,94 @@ contract UniswapResolver is UniswapLiquidity {
(uint _type, uint _id) = connectorID();
EventInterface(getEventAddr()).emitEvent(_type, _id, _eventCode, _eventParam);
}
function buyViaPath(
address buyAddr,
address sellAddr,
uint buyAmt,
uint unitAmt,
address[] calldata paths,
uint getId,
uint setId
) external payable {
uint _buyAmt = getUint(getId, buyAmt);
(TokenInterface _buyAddr, TokenInterface _sellAddr) = changeEthAddress(buyAddr, sellAddr);
IUniswapV2Router02 router = IUniswapV2Router02(getUniswapAddr());
uint _slippageAmt = convert18ToDec(_sellAddr.decimals(),
wmul(unitAmt, convertTo18(_buyAddr.decimals(), _buyAmt)));
checkPaths(router, paths);
uint _expectedAmt = getExpectedSellAmt(router, paths, _buyAmt);
require(_slippageAmt >= _expectedAmt, "Too much slippage");
convertEthToWeth(_sellAddr, _expectedAmt);
_sellAddr.approve(address(router), _expectedAmt);
uint _sellAmt = router.swapTokensForExactTokens(
buyAmt,
_expectedAmt,
paths,
address(this),
now + 1
)[0];
convertWethToEth(_buyAddr, buyAmt);
setUint(setId, _sellAmt);
emitLogBuyPath(buyAddr, sellAddr, _buyAmt, _sellAmt, paths, getId, setId);
}
function sellViaPath(
address buyAddr,
address sellAddr,
uint sellAmt,
uint unitAmt,
address[] calldata paths,
uint getId,
uint setId
) external payable {
uint _sellAmt = getUint(getId, sellAmt);
(TokenInterface _buyAddr, TokenInterface _sellAddr) = changeEthAddress(buyAddr, sellAddr);
if (_sellAmt == uint(-1)) {
_sellAmt = sellAddr == getEthAddr() ? address(this).balance : _sellAddr.balanceOf(address(this));
}
uint _slippageAmt = convert18ToDec(_buyAddr.decimals(),
wmul(unitAmt, convertTo18(_sellAddr.decimals(), _sellAmt)));
IUniswapV2Router02 router = IUniswapV2Router02(getUniswapAddr());
checkPaths(router, paths);
uint _expectedAmt = getExpectedBuyAmt(router, paths, _sellAmt);
require(_slippageAmt <= _expectedAmt, "Too much slippage");
convertEthToWeth(_sellAddr, _sellAmt);
_sellAddr.approve(address(router), _sellAmt);
uint _buyAmt = router.swapExactTokensForTokens(
_sellAmt,
_expectedAmt,
paths,
address(this),
now + 1
)[1];
convertWethToEth(_buyAddr, _buyAmt);
setUint(setId, _buyAmt);
emitLogSellPath(buyAddr, sellAddr, _buyAmt, _sellAmt, paths, getId, setId);
}
}